As electronics get smaller,
the industry is undergoing
significant architectural
shifts, pushing power
vendors to become more
creative and develop
solutions that address
multiple challenges."
Emmanuel Loza
Director, Power Systems Applications,
Analog Devices
C h a p t e r 3 | P o w e r P r o c e s s o r s a n d F P G A s
sequencing circuits to orchestrate the power-up and
power-down sequence of various voltage rails, so
that each rail reaches its designated voltage level
within its required ramp time and order.
Load transients are also a critical consideration for
processor and FPGA power management, which
must always keep the core voltage within tolerance—
constant voltage is ideal but not realistic. Transient
response can be optimized by ensuring the power
supply is switching at the highest frequency. Load
transient response is especially critical in 5G
communications, where customers are requesting that
load transient response times be within 2μs to support
the necessary transmission and reception switching.
Parasitics between the power supply and the
processor or FPGA must also be reduced if the
power supply is to deliver power without the voltage
dipping too much, which means the power supply
must be placed as close as possible. Capacitors
can help, but they occupy space on the
board and increase costs.
19
Power Management: Efficiently Powering Processors, FPGAs, and Microcontrollers
